Mr. Sam Leung reports

SPIN-OUT FROM ALDEBARAN: CENTAURI MINERALS ANNOUNCES APPROVAL OF DRILLING PERMIT FOR THE RIO GRANDE GOLD-COPPER PROJECT AND TEAM ADDITIONS

Aldebaran Resources Inc. and Centauri Minerals Inc. have received a drilling permit for the Rio Grande gold-copper project located in Salta, Argentina. Centauri has commenced exploration targeting programs and mobilization activities in preparation for future drilling programs at Rio Grande. Additionally, Centauri is pleased to announce key additions to its management team and board of directors.

Highlights

• Centauri has commenced exploration targeting programs, mobilization activities and received approval of the drilling permit for the Rio Grande gold-copper project from the government of Salta province, Argentina.
• Centauri management team additions: Ignacio Butler (development and sustainability manager) and Dario Gonzalez (exploration manager) -- both with extensive experience in field exploration and stakeholder engagement in Northern Argentina, with both from and based in Salta, Argentina.
• Centauri adds to board of directors: Amalia Saenz (independent director) and Christopher Stackhouse (independent director) -- decades of combined commercial, legal and governance experience in the natural resources sector, based in Buenos Aires and Toronto, respectively.

Sam Leung, chief executive officer and director of Centauri, commented: "The Centauri team is pleased to announce that we have officially obtained the drilling permit for the Rio Grande gold-copper project from the government of Salta province. During the first half of 2026, Centauri has commenced an exploration targeting program at Rio Grande, which includes an expanded geophysical scope of work from the last program in 2011. This new drilling permit allows Centauri to test new targets starting in the second half of 2026, which will be the first drill holes at Rio Grande since 2013.

"I am pleased to welcome both Ignacio Butler and Dario Gonzalez to the Centauri management team who are already working closely with the Aldebaran team and regional communities to ensure continuity and take new charge of our exploration portfolio in Northern Argentina. Their extensive in-region experience and local perspectives immediately add to Centauri's capabilities on the ground as we kick off our exploration programs.

"In addition, I am pleased to welcome Amalia Saenz and Christopher Stackhouse to our board as new independent directors. They are experienced multifaceted professionals with proven contributions to growth-focused businesses in the natural resources sector, particularly in Argentina and South America. Their guidance and advice are expected to help Centauri navigate and execute on our ambition for new discoveries."

Exploration update and drilling permit approval

Centauri's immediate exploration focus is on the Rio Grande gold-copper project after the recent completion of the mineral resource update and National Instrument 43-101 technical report (see Aldebaran/Centauri news releases dated March 2 and April 16, 2026). This focus is followed by evaluation of new targets at the Aguas Calientes project (Jujuy), which was last worked on in 2019, as well as the other four portfolio projects with prospective historical samples. Below is an update of Centauri's recent progress:

• Approval of drilling permit for the Rio Grande gold-copper project -- The government of Salta province, through its Secretariat of Mining, has reviewed and approved a previously submitted environmental social impact report and permit application, and granted Centauri approval to begin a new drilling program, which would be the first since 2013. This follows a camp easement approval for the project which has allowed the Centauri field team to begin remobilization efforts in support of immediate targeting programs ahead of future drilling programs.
• Geophysical review and new modern program -- With consulting experts, Centauri has commenced a review of 2011 and older geophysical and related information. A much larger area is proposed for a new higher power magnetotellurics (MT) survey, which is expected to commence in the third quarter of 2026. Following this MT survey on Rio Grande, Centauri will consider audio-magnetotellurics (AMT) and other geophysical methods for the Aguas Calientes project in search of the source(s) of the high-grade gold-silver float boulders over a six-kilometre span.
• Metallurgical review and recommendation program -- Centauri has engaged experienced consulting metallurgists to review and consolidate the historical testwork that was completed by previous owners of the Rio Grande project, to identify gaps and form recommendations for future drilling and testing areas. The recently updated mineral resource estimate together with these recommendations are expected to help form the basis of future engineering studies. Included in this scope of work are high level evaluations of processing routes, including potential synergies with regional mine-mill complexes.
• Geochemical and structural surveys -- Centauri has furthered internal and external (with consultants) discussions on geochemical and structural survey programs at Rio Grande, Aguas Calientes and the other projects. These include long-standing partnership relationships that Aldebaran have with a number of mineral exploration-related departments in several universities in Argentina (such as two PhD students currently). Discussions of work scope and timing are continuing.

The results of the above programs are expected to assist Centauri in defining, evaluating, and prioritizing the first drill holes at Rio Grande since 2013 and at Aguas Calientes since 2019. The goal is to increase the probability of exploration and drilling success for Centauri in 2026 and beyond.

Centauri's management and board additions

• Ignacio Butler -- development and sustainability manager

An Argentine based in Salta with over 15 years of experience in the natural resources sector, Mr. Butler is the strategic liaison between Centauri's exploration operations, government authorities and regional communities. Before joining Centauri, he was a managing partner and co-founder of Dynamik, a local environmental consultancy, where for over seven years he oversaw business administration, contract negotiations and project control management, focusing on projects and mines in Northern Argentina. Combining his corporate leadership with technical field expertise, Mr. Butler also served as a field campaign leader, implementing innovative remote sensing technologies and logistical tools for major mining projects in the region. Mr. Butler is a natural resources and environmental engineer from the National University of Salta (UNSa), holds an MBA and has completed executive management studies at IAE Business School.

• Dario Gonzalez -- exploration manager

An Argentine based in Salta with over 15 years of exploration experience, Mr. Gonzalez is a geologist leading this new chapter of exploration on Centauri's portfolio with the continuity and guidance of advisers led by Kevin Heather and John Black of Aldebaran. Mr. Gonzalez has a strong background in mineral exploration, geochemistry and geological modelling on projects in Argentina, Chile and Peru, which range from early stage greenfield exploration through to mine operations. Before joining Centauri, Mr. Gonzalez was head of exploration for the polymetallic Providencia mine in Jujuy province. He has extensive experience in multivariate geochemical analysis, project evaluation, ore control, 3-D geological modelling and geostatistical evaluation of deposits -- including modern tools such as ioGAS, Leapfrog Geo and QGIS/ArcGIS Pro, applied to the integration and interpretation of geological data. As an exploration geologist in Argentina, Mr. Gonzalez has also worked for Barrick, First Quantum, McEwen Copper and Austral Gold. Mr. Gonzalez is a geology graduate from the National University of Salta (UNSa).

• Amalia Saenz -- independent director

Based in Buenos Aires, Ms. Saenz is an Argentine lawyer and strategic adviser with more than 30 years of experience in Argentina and internationally in energy, mining, oil and gas, and natural resources industries. Ms. Saenz is an alternate director of Transener, a utility company focused on high-voltage transmission in Argentina as a representative of Pampa Energia, the largest power generator company in Argentina -- both publicly listed in Argentina (with Pampa also listed on the New York Stock Exchange through ADRs). Previously, Ms. Saenz served as senior vice-president and country manager Argentina at Lake Resources NL, after initially joining the Australian-listed lithium company as a non-executive director. For more than a decade, Ms. Saenz was a partner at well-known law firm Brons & Salas, focusing on oil and gas, natural resources, and energy-related matters. Before becoming a partner, she worked at major law firms and for multinational companies, including with Pan American Energy (formerly Bridas Energy International) where she led legal affairs and spent significant time in the United Kingdom and Central Asia.

In academia, Ms. Saenz serves as a professor in the executive program on mining law at Universidad Torcuato Di Tella (Buenos Aires, Argentina), where she teaches international contracts. Ms. Saenz is an alumnus of the University of Buenos Aires, with postgraduate degrees in oil and gas law and environmental law. She is also a member of the Australian Institute of Company Directors (AICD).

Christopher Stackhouse -- independent director

Based in Toronto, Mr. Stackhouse is a finance and capital markets professional with over 20 years of experience in managing exploration and development stage assets through their operations, with a notable focus on South America. Most recently, Mr. Stackhouse was chief financial officer of SolGold PLC from 2023 until its sale to Jiangxi Copper in 2026. His past responsibilities include senior finance roles at Guyana Goldfields Inc. (acquired by Zijin Mining Group), Rockcliff Metals (acquired by Hudbay Minerals) and Generation Mining, where he gained extensive experience in public financing, project development and operations. Mr. Stackhouse began his career as audit manager with PwC, where he obtained his CPA and CA before relocating to PwC Chile for three years.

Outside of Centauri, Mr. Stackhouse is an independent director on the board of Rocky Shore Gold Ltd. He also holds an honours business administration BBA degree from Wilfrid Laurier University (Canada).

Qualified person

The scientific and technical data contained in this news release has been reviewed and approved by Dr. Kevin B. Heather, BSc (honours), MSc, PhD, FAusIMM, FGS, chief geological officer and director of Aldebaran, who serves as the qualified person (QP) under the definitions of National Instrument 43-101.

About Aldebaran Resources Inc.

Aldebaran is a mineral exploration company that was spun out of Regulus Resources Inc. in 2018 and has the same core management team. Aldebaran holds an 80-per-cent interest in the Altar copper-gold project in San Juan province, Argentina. The Altar project hosts multiple porphyry copper-gold deposits with potential for additional discoveries. Altar forms part of a cluster of world-class porphyry copper deposits which includes Los Pelambres (Antofagasta Minerals), El Pachon (Glencore) and Los Azules (McEwen Copper). In November, 2024, the company announced an updated mineral resource estimate for the Altar project, prepared by Independent Mining Consultants Inc. and based on the drilling completed up to and including the 2023 to 2024 field season (independent technical report prepared by Independent Mining Consultants Inc., Tucson, Ariz., titled "Technical Report, Estimated Mineral Resources, Altar Project, San Juan Province, Argentina," dated Dec. 31, 2024 -- see news release dated Nov. 25, 2024). In October, 2025, the company announced a preliminary economic assessment (PEA) for the Altar project (independent technical report prepared by SRK Consulting Inc, Denver, Colo., titled "NI 43-101 Technical Report Preliminary Economic Assessment Altar Project San Juan, Argentina," dated Sept. 30, 2025 -- see news release dated Oct. 30, 2025).

About Centauri Minerals Inc.

Centauri Minerals is a new mineral exploration company focused on Northern Argentina, a mining region of increasing global significance. Centauri holds 100-per-cent interest in a portfolio of exploration projects spanning approximately 40,000 hectares in the provinces of Salta, Jujuy and Catamarca, which was spun out from Aldebaran Resources Inc. The most advanced is the Rio Grande gold-copper project located in Salta, which has an independent NI 43-101 compliant mineral resource estimate that highlights significant gold and copper quantities. Centauri has offices and facilities in Salta, Argentina, and Vancouver, Canada. It is currently a private company majority owned by Aldebaran Resources Inc. with plans to become a public company in 2026.

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